Updating trunk VERSION from 3617.0 to 3618.0

# This is an automated release commit.
# Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true
TBR=mmoss@chromium.org

Change-Id: Ia70ab8d6553e967a3c318124b5db9a16be6e5d0b
Reviewed-on: https://chromium-review.googlesource.com/c/1344940Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609911}

chrome/VERSION

 MAJOR=72
 MINOR=0
-BUILD=3617
+BUILD=3618
 PATCH=0